package Fiest_01.second;
public class areademo {
    public static void main(String[] args) {
        area s1=new area();
        s1.setR(5);
        s1.setA(4);
        s1.setB(5);
        s1.yuan();
        s1.changfangxing();

        area s2=new area(5,4,5);
        s2.yuan();
        s2.changfangxing();
    }
}